Parsing SQL Queries by semicolon - sql

Question

I'm trying to read, using Scala, a sql file full of queries to be executed, however, I'm struggling to parse special cases that contain a semicolon that is not the terminator. For example, if the query is:
SELECT * FROM table WHERE name LIKE "%;%",
It separates this into two statements even though it should be one.

Answer 1

Assuming that the query terminator is always a ; at the end of a line, we can make good use of
.split(";\\s*\\n"); matching the ; zero or more whitespace characters follows by an newline character.
or .split("(?m);\\s*$") using the inline (?m) multiline modifier that allows us to match the end of the line with $).
Sample Code:
val a = """SELECT * FROM table WHERE name LIKE "%;%"
AND regexp_replace(
'abcd1234df-TEXT_I-WANT' -- use your input column here instead
, '^[a-z0-9]{10}-(.*)\$' -- matches whole string, captures "TEXT_I-WANT" in \$1
, '\$1' -- inserts \$1 to returnÖ TEXT_I-WANT
) = 'TEXT_I-WANT'
;
SELECT * FROM table WHERE name LIKE "%;%"
AND regexp_replace(
'abcd1234df-TEXT_I-WANT' -- use your input column here instead
, '^[a-z0-9]{10}-(.*)\$' -- matches whole string, captures "TEXT_I-WANT" in \$1
, '\$1' -- inserts \$1 to returnÖ TEXT_I-WANT
) = 'TEXT_I-WANT'
;""".split(";\\s*\\n")
println(a.mkString("Next Query:"))
If you prefer to match, this pattern can do a good job too: "(?m)^[\\s\\S]*?;$"
(add additional whitespace \s as needed)
Full Sample:
import scala.util.matching.Regex
object Demo {
def main(args: Array[String]) {
val pattern = new Regex("(?m)^[\\s\\S]*?;\\s*$")
val str = """SELECT * FROM table WHERE name LIKE "%;%"
AND regexp_replace(
'abcd1234df-TEXT_I-WANT' -- use your input column here instead
, '^[a-z0-9]{10}-(.*)\$' -- matches whole string, captures "TEXT_I-WANT" in \$1
, '\$1' -- inserts \$1 to returnÖ TEXT_I-WANT
) = 'TEXT_I-WANT'
;
SELECT * FROM table WHERE name LIKE "%;%"
AND regexp_replace(
'abcd1234df-TEXT_I-WANT' -- use your input column here instead
, '^[a-z0-9]{10}-(.*)\$' -- matches whole string, captures "TEXT_I-WANT" in \$1
, '\$1' -- inserts \$1 to returnÖ TEXT_I-WANT
) = 'TEXT_I-WANT'
;"""
println((pattern findAllIn str).mkString("\n----------------\n"))
}
}

Answer 2

Try Regex: ^.*?;$ with m option (to match new line) as mentioned here
Demo